16138444 has 18 divisors (see below), whose sum is σ = 32853660. Its totient is φ = 6916392.

The previous prime is 16138403. The next prime is 16138477. The reversal of 16138444 is 44483161.

It is a super-2 number, since 2×16138444² = 520898749482272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40974 + ... + 41365.

Almost surely, 2^16138444 is an apocalyptic number.

16138444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16138444 is an abundant number, since it is smaller than the sum of its proper divisors (16715216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16138444 is a wasteful number, since it uses less digits than its factorization.

16138444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82357 (or 82348 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 16138444 is about 4017.2682260462. The cubic root of 16138444 is about 252.7089092246.

The spelling of 16138444 in words is "sixteen million, one hundred thirty-eight thousand, four hundred forty-four".